scholarly journals Hot spots on Io: Initial results from Galileo's near infrared mapping spectrometer

1997 ◽  
Vol 24 (20) ◽  
pp. 2439-2442 ◽  
Author(s):  
Rosaly Lopes-Gautier ◽  
A. G. Davies ◽  
R. Carlson ◽  
W. Smythe ◽  
L. Kamp ◽  
...  
Keyword(s):  
Hot Spots ◽  
Near Infrared ◽  
Initial Results

scholarly journals Galileo NIMS Observations of Io

2002 ◽  
Vol 12 ◽  
pp. 614-617
Author(s):  
Ashley Gerard Davies ◽  
Sylvain Douté
Keyword(s):  
Grain Size ◽  
Sulfur Dioxide ◽  
Hot Spots ◽  
Near Infrared ◽  
Volcanic Eruptions ◽  
Infrared Observations ◽  
Jovian Satellite

AbstractThe Near Infrared Mapping Spectometer (NIMS) on the Galileo spacecraft has been observing the volcanic Jovian satellite Io at regular intervals since June 1996. These infrared observations have allowed detailed mapping of the distribution and grain size of sulfur dioxide on Io’s surface, identification of volcanic centers, mapping of the distribution of hot spots, and investigations into the style and evolution of individual volcanic eruptions.

scholarly journals The Great Observatories Origins Deep Survey: Initial Results from Optical and Near-Infrared Imaging

2004 ◽  
Vol 600 (2) ◽  
pp. L93-L98 ◽  
Author(s):  
M. Giavalisco ◽  
H. C. Ferguson ◽  
A. M. Koekemoer ◽  
M. Dickinson ◽  
D. M. Alexander ◽  
...  
Keyword(s):  
Near Infrared ◽  
Infrared Imaging ◽  
Near Infrared Imaging ◽  
Deep Survey ◽  
Initial Results

scholarly journals Planetary nebulae in the VISTA Magellanic Cloud (VMC) Survey

2011 ◽  
Vol 7 (S283) ◽  
pp. 444-445
Author(s):  
Brent Miszalski ◽  
Ralph Napiwotzki ◽  
Maria-Rosa L. Cioni ◽  
Martin A. T. Groenewegen ◽  
Jose M. Oliveira ◽  
...  
Keyword(s):  
Luminosity Function ◽  
Near Infrared ◽  
Planetary Nebulae ◽  
Large Magellanic Cloud ◽  
Magellanic Cloud ◽  
Magellanic Clouds ◽  
First Year ◽  
Complementary Role ◽  
Initial Results ◽  
Central Stars

AbstractThe multi-epoch YJKs sub-arcsecond photometry of the VMC survey provides a long anticipated deep near-infrared (NIR) window into further understanding the stellar populations of the Magellanic Clouds. The first year of observations consisted of six tiles covering ~9% of the Large Magellanic Cloud (LMC) survey region and contains 102 objects previously classified as planetary nebulae (PNe). A large proportion of the sample were found to be contaminated by non-PNe. These initial results underline the importance of establishing a clean catalogue of LMC PNe before they are applied in areas such as the planetary nebula luminosity function (PNLF) and searches for binary central stars. As the VMC survey progresses it will play a fundamental role in cleaning extant PN catalogues and a complementary role in the discovery of new PNe.

scholarly journals Near-Infrared View of the Nuclear Region of NGC 1808

1997 ◽  
Vol 159 ◽  
pp. 349-350
Author(s):  
J. K. Kotilainen
Keyword(s):  
Hot Spots ◽  
Near Infrared ◽  
Star Formation Rate ◽  
Hot Spot ◽  
Formation Rate ◽  
Line Emission ◽  
Continuum Emission ◽  
Starburst Galaxy ◽  
Nir Imaging ◽  
Red Supergiants

AbstractWe discuss NIR imaging of the starburst galaxy NGC 1808. The circumnuclear continuum emission shows no morphological change with wavelength and most of it is produced by an evolved bulge population, not by red supergiants or dust. The line emission arises from distinct hot spots. From comparison of Brγ and Hα fluxes, we derive extinction Av = 3–5 toward the hot spots. From modeling of the line and continuum luminosities, we derive a star-formation rate of 0.1–0.6 M⊙ yr–1 and SN rate ~ 0.4–11 × 10–3 yr–1 per hot spot. The age of the burst is 8–17 Myr for the hot spots and ~ 40 Myr for the nucleus. Finally, evidence for and against hidden Seyfert activity in NGC 1808 is discussed.

scholarly journals A Near-Infrared Spectral Sequence of Late M, L, and T Dwarfs

2003 ◽  
Vol 211 ◽  
pp. 389-392
Author(s):  
Michael C. Cushing ◽  
John T. Rayner ◽  
William D. Vacca
Keyword(s):  
Spectral Sequence ◽  
Emission Spectrum ◽  
Atomic Absorption ◽  
Near Infrared ◽  
Late Type ◽  
Medium Resolution ◽  
Infrared Spectral ◽  
Absorption Features ◽  
Initial Results

We present the initial results of a medium resolution, 0.8 to 4.2 μm spectroscopic survey of M, L, and T dwarfs. We have identified the most prominent molecular and atomic absorption features found in the spectra of these late-type dwarfs. We have also compared the spectra to a laboratory FeH emission spectrum and identified nearly 100 features common to the FeH spectrum and the dwarf spectra from 0.99 to 1.8 μm.

Cautionary Analysis of Spectral Radiance from Io’s Active Volcanoes Derived from Galileo Near-Infrared Mapping Spectrometer Data

2021 ◽  
Vol 163 (1) ◽  
pp. 2
Author(s):  
Ashley Gerard Davies
Keyword(s):  
Hot Spots ◽  
Near Infrared ◽  
Hot Spot ◽  
Spectral Radiance ◽  
Temperature Model ◽  
Multiple Orders ◽  
Unit Conversion ◽  
Spectrometer Data ◽  
Detector Saturation ◽  
Active Volcanoes

Abstract Between 1996 and 2001, the Galileo Near-Infrared Mapping Spectrometer (NIMS) obtained 190 observations of the volcanic Jovian moon Io. Rathbun et al. (2018) [Astron. J., 156, 207] published a list of 287 measurements of 3.5 μm spectral radiance from some of Io’s active volcanoes, derived from a subset of the NIMS data. However, the spectral radiances reported by Rathbun et al. are lower, in some cases by multiple orders of magnitude, than other analyses of the same observations and spectral radiances derived from contemporaneous ground-based data. In many cases, the Rathbun et al. hot-spot radiances are underreported by a factor of π, likely due to a mistake in unit conversion. For a small number of powerful hot spots, additional discrepancies appear to be the result of poor fits to data limited in wavelength range by NIMS detector saturation and a methodology that discards short-wavelength NIMS data that otherwise would have provided more robust temperature model fits.

Io's hot spots in the near-infrared detected by LEISA during the New Horizons flyby

2014 ◽  
Vol 119 (10) ◽  
pp. 2222-2238 ◽  
Author(s):  
Constantine C. C. Tsang ◽  
Julie A. Rathbun ◽  
John R. Spencer ◽  
Brigette E. Hesman ◽  
Oleg Abramov
Keyword(s):  
Hot Spots ◽  
Near Infrared ◽  
New Horizons

scholarly journals Diffraction Limited Imaging of High Redshift Galaxies with Adaptive Optics

2001 ◽  
Vol 205 ◽  
pp. 455-456 ◽  
Author(s):  
R.I. Davies ◽  
M. Lehnert ◽  
A.J. Baker ◽  
S. Rabien
Keyword(s):  
Adaptive Optics ◽  
Near Infrared ◽  
High Redshift ◽  
Diffraction Limit ◽  
High Redshift Galaxies ◽  
Distant Galaxies ◽  
Imaging And Spectroscopy ◽  
Intermediate Redshift ◽  
Initial Results ◽  
Redshift Galaxies

The major cornerstone of future ground-based astronomy is imaging and spectroscopy at the diffraction limit using adaptive optics. To exploit the potential of current AO systems, we have begun a survey around bright stars to study intermediate redshift galaxies at high resolution. Using ALFA to reach the diffraction limit of the 3.5-m telescope at Calar Alto allows us to study the structure of distant galaxies in the near-infrared at scales of 100-150 pc for z=0.05 and at scales 1.0-1.5 kpc at z=1. In this contribution we present the initial results of this project, which hint at the exciting prospects possible with the resolution and sensitivity available using an AO camera on the 8-m class VLT.

scholarly journals Multi-band high resolution spectroscopy rules out the hot Jupiter BD+20 1790b

2018 ◽  
Vol 613 ◽  
pp. A50 ◽  
Author(s):  
I. Carleo ◽  
S. Benatti ◽  
A. F. Lanza ◽  
R. Gratton ◽  
R. Claudi ◽  
...  
Keyword(s):  
Radial Velocity ◽  
Hot Spots ◽  
Near Infrared ◽  
High Resolution Spectroscopy ◽  
Velocity Measurements ◽  
Stellar Activity ◽  
Multi Wavelength ◽  
First Time ◽  
Multi Band

Context. Stellar activity is currently challenging the detection of young planets via the radial velocity (RV) technique. Aims. We attempt to definitively discriminate the nature of the RV variations for the young active K5 star BD+20 1790, for which visible (VIS) RV measurements show divergent results on the existence of a substellar companion. Methods. We compare VIS data with high precision RVs in the near-infrared (NIR) range by using the GIANO–B and IGRINS spectrographs. In addition, we present for the first time simultaneous VIS-NIR observations obtained with GIARPS (GIANO–B and HARPS–N) at Telescopio Nazionale Galileo (TNG). Orbital RVs are achromatic, so the RV amplitude does not change at different wavelengths, while stellar activity induces wavelength-dependent RV variations, which are significantly reduced in the NIR range with respect to the VIS. Results. The NIR radial velocity measurements from GIANO–B and IGRINS show an average amplitude of about one quarter with respect to previously published VIS data, as expected when the RV jitter is due to stellar activity. Coeval multi-band photometry surprisingly shows larger amplitudes in the NIR range, explainable with a mixture of cool and hot spots in the same active region. Conclusions. In this work, the claimed massive planet around BD+20 1790 is ruled out by our data. We exploited the crucial role of multi-wavelength spectroscopy when observing young active stars: thanks to facilities like GIARPS that provide simultaneous observations, this method can reach its maximum potential.

Keck near-infrared observations of the Orion proplyds: initial results

2003 ◽  
Author(s):  
Ralph Y. Shuping ◽  
Jennifer Patience ◽  
John Bally ◽  
Mark Morris ◽  
James E. Larkin ◽  
...  
Keyword(s):  
Near Infrared ◽  
Infrared Observations ◽  
Initial Results
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